问题：
A . Most women take walking as their only recreational activity
B . Walking was the only recreational activity for about half of the women
C . The study aims to track the health conditions of its subjects
D . Irregular walking increased the risk of breast cancer in post-menopausal women
● 参考解析
【答案】B
【解析】根据第三段“Of the women，47％said walking was their only recreational activity．Those who walked for at least seven hourS per week had a 1 4％lower risk of breast cancer compared to those who walked three or fewer hours per week…”可知B选项正确，即散步是大约一半的妇女的唯一的休闲活动。
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